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参数资料
| 型号： | FSL116HR |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.24 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, DIP8 |
| 封装： | MS-001BA, DIP-8 |
| 文件页数： | 3/13页 |
| 文件大小： | 862K |
| 代理商： | FSL116HR |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSL116HR Rev. 1.0.0
11
FSL116HR
—
Green
M
ode
Fairchild
Power
Swit
ch
(
F
PS)
Output-Short Protection (OSP)
If the output is shorted, steep current with extremely
high di/dt can flow through the SenseFET during the
LEB time. Such a steep current brings high-voltage
stress on the drain of SenseFET when turned off. To
protect the device from such an abnormal condition,
OSP detects VFB and SenseFET turn-on time. When the
VFB is higher than 1.6V and the SenseFET turn-on time
is lower than 1.0s, the FPS recognizes this condition
as an abnormal error and shuts down PWM switching
until VCC reaches VSTART again. An abnormal condition
output is shown in Figure 20.
Figure 20.Output Short Waveforms (OSP)
Soft-Start
The FPS has an internal soft-start circuit that slowly
increases the feedback voltage, together with the
SenseFET current, after it starts. The typical soft-start
time is 20ms, as shown in Figure 21, where progressive
increments of the SenseFET current are allowed during
the startup phase. The pulse width to the power
switching device is progressively increased to establish
the correct working conditions for transformers,
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention
of smoothly establishing the required output voltage.
Soft-start helps to prevent transformer saturation and
reduces the stress on the secondary diode.
Figure 21. Internal Soft-Start
Burst Mode Operation
To minimize power dissipation in Standby Mode, the
FPS enters Burst Mode. As the load decreases, the
feedback voltage decreases. As shown in Figure 22,
the device automatically enters Burst Mode when the
feedback voltage drops below VBURH. Switching
continues, but the current limit is fixed internally to
minimize flux density in the transformer. The fixed
current limit is larger than that defined by VFB = VBURH
and, therefore, VFB is driven down further. Switching
continues until the feedback voltage drops below VBURL.
At this point, switching stops and the output voltages
start to drop at a rate dependent on the standby current
load. This causes the feedback voltage to rise. Once it
passes VBURH, switching resumes. The feedback
voltage then falls and the process repeats. Burst Mode
alternately enables and disables switching of the
SenseFET and reduces switching loss in Standby Mode.
Figure 22. Burst-Mode Operation
Adjusting Peak Current Limit
As shown in Figure 23, a combined 6k internal
resistance is connected to the non-inverting lead on the
PWM comparator. An external resistance of Rx on the
current limit pin forms a parallel resistance with the 6k
when the internal diodes are biased by the main current
source of 400A. For example, FSL116HR has a typical
SenseFET peak current limit (ILIM) of 1.1A. ILIM can be
adjusted to 0.8A by inserting Rx between the IPK pin and
the ground. The value of the Rx can be estimated by
the following equations:
XkΩ
:
6kΩ
0.8A
:
1.1A
=
(1)
6kΩ
||
Rx
X =
(2)
where X is the resistance of the parallel network.
Figure 23. Peak Current Limit Adjustment
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相关代理商/技术参数 |
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|---|---|
| FSL116LR | 功能描述:电流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FSL117HLNY | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FSL117MRIN | 功能描述:电源开关 IC - 配电 Green-Mode Fairchild Power Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSL126HR | 功能描述:电流型 PWM 控制器 Green Mode Fairchild Power Switch (FPS) RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FSL126MR | 功能描述:电流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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